fix: disable startup media scan

Skip incomplete series check on server startup to reduce
startup time. Can be re-enabled by restoring _check_media_scan_status().

src/server/services/initialization_service.py

@@ -544,10 +544,9 @@ async def _check_media_scan_status() -> bool:
     Returns:
         bool: True if media scan was completed, False otherwise
     """
-    return await _check_scan_status(
-        check_method=lambda svc, db: svc.is_initial_media_scan_completed(db),
-        scan_type="media"
-    )
+    # DISABLED: Always return True to skip startup scan
+    # To re-enable, change to: return await _check_scan_status(...)
+    return True
 
 
 async def _mark_media_scan_completed() -> None: